/Engine/Plugins/BlueprintFileUtils/Source/BlueprintFileUtils/Public/BlueprintFileUtilsBPLibrary.h
Makes a new directory, and optionally sub-directories
true if the directory was created, false otherwise
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(BlueprintCallable, Category="FileUtils") static bool MakeDirectory ( const [FString](API\Runtime\Core\Containers\FString) & Path, bool bCreateTree )